The Germans had now crossed at several points the Libau-Dunaburg railway. They were in Telsche and Trischki. Their cavalry pushed ahead at full speed with orders to destroy the railways wherever it found them. On the road to Mitau they captured Russian machine guns, ammunition wagons, and baggage, and broke up the railway tracks to the southwest and northwest of Shavli. The Russians who had been taken by surprise by this movement had apparently only weak forces in Courland, and these had retired while reenforcements were being rushed up by railway. The German infantry, upon the receipt of reports that the Russians were moving up by rail from Kovno on their right flank, was ordered to stop its advance and prepare to hold the Dubissa line, taking up a front running a little east of south. Cavalry moving forward in the center of the German advance on the 3d of May, 1915, got within two kilometers of Mitau, going beyond Gruenhof and capturing 2,000 Russians. At Skaisgiry on the day before 1,000 prisoners had been taken, and Janischki and Shagory had been occupied far beyond the Libau-Dunaburg railway. By this time Russian reenforcements were arriving at Mitau in huge numbers. The German cavalry ultimately fell back after indicting all possible damage to the communications in their reach. The Germans prided themselves a good deal on the marching of their troops in this swift advance. They pointed out that the roads were in extremely bad condition, the bridges for the most destroyed, and the population to a large extent hostile. A military correspondent figured that for a daily march of fifty kilometers, such as was frequently made in Courland, 62,000 steps of an average of eighty centimeters were required. This for a day's march of from nine to ten hours gives an average of five to six kilometers per hour, some 6,000 to 7,000 steps. That makes in the neighborhood of 100 steps per minute, which the correspondent regarded as a considerable accomplishment when allowance is made for the fact that this was kept up hour after hour in full marching equipment. The column coming from Memel, directed along the Baltic shores, had been steadily moving on Libau. In preparation for the land attack German naval vessels on the 29th of April had bombarded the forts defending the town. On the 6th of May the Russians themselves blew up one of the forts on the eastern front. The shore batteries were soon after silenced by German fire. The German troops advancing from the land side took the forts on the south almost without opposition. Russian troops which had been unloaded at Mitau and sent forward toward the southwest were unable to come up in time to offer any obstacles to the German advance, and on the 8th of May, at six o'clock in the morning, the German soldiers marched into Libau, where they took about 1,500 prisoners, twelve guns, and a number of machine guns.